EUVD-2026-64977
GHSA-qcvv-68pq-9wgw
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible web interface requires administrative credentials (PR:H); root-level command execution yields high C/I/A with no scope change beyond the compromised device.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the webBackupAction function. The vulnerability is caused by insufficient filtering of the option, key, pw_encode, pathN, and valueN fields before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges. Exploitation requires valid administrative credentials for the device's web management interface.
AnalysisAI
Command injection in the DrayTek VigorSwitch webBackupAction function allows authenticated remote attackers to execute arbitrary OS commands with root privileges across more than 25 managed switch models. Insufficient input sanitization of the option, key, pw_encode, pathN, and valueN parameters enables shell metacharacter injection, resulting in full device compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires possession of valid administrative credentials for the DrayTek VigorSwitch web management interface, confirmed by CVSS PR:H. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.6 accurately reflects the high C/I/A impact of root-level command execution on a managed network switch, which sits at a position of significant trust within enterprise and SMB topologies. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply vendor-released firmware patches for each affected VigorSwitch model as detailed in DrayTek's August 2026 security advisory at https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/; exact patched firmware version numbers per model are listed there and not independently confirmed in available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all DrayTek VigorSwitch deployments and cross-reference against the 25+ affected models documented in CVE-2026-71918; identify and audit administrative credential holders and their access points. …
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Same weakness CWE-78 – OS Command Injection
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External POC / Exploit Code
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